Originally Posted by Blizzard Entertainment
Countless ages ago, Warlord Zon'ozz and his soldiers waged endless war against the forces of C'Thun and Yogg-Saron. Millennia have passed, but the warlord still serves the chaotic might of the Old God N'Zoth. Deathwing has now unleashed this legendary faceless one to crush the defenders of Wyrmrest Temple.
So basically, while the warlord was serving N'Zoth, he was enemies of C'Thun and Yogg-Saron. Weren't the Old Gods all on the same side? In the WotA trilogy, "The Three" seem to be working together to get free, using the Demon Soul, yet now it seems they were enemies in the past. Are they still enemies with each other? Or are they allied together?